cmake HAS_STRCASESTR examples

KeystoneHQ/keystone3-firmware external/cryptoauthlib/lib/CMakeLists.txt :71 

check_symbol_exists(strcasestr "string.h" HAS_STRCASESTR)

KeystoneHQ/keystone3-firmware external/cryptoauthlib/lib/CMakeLists.txt :361 

endif(HAS_STRCASESTR)